Across
- 2. found in all living things
- 4. Symbol for Radon
- 5. 16 protons in its nucleus
- 8. Used in light up signs
- 10. Lightweight metal used in soda cans
- 13. Atomic number 18
- 14. Atomic number 30
- 16. Li for short
- 18. lightest element
Down
- 1. 2 letters for lead
- 3. most abundant gas in troposphere
- 6. used in nuclear energy
- 7. Found in sand and quartz
- 9. important for strong bones
- 11. the only metal that's liquid at room temp
- 12. most abundant element on earth
- 15. binds with Na to form table salt
- 17. Magnetic